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/*
* OF helpers for External connector (extcon) framework
*
* Copyright (C) 2013 Texas Instruments, Inc.
* Kishon Vijay Abraham I <kishon@ti.com>
*
* Copyright (C) 2013 Samsung Electronics
* Chanwoo Choi <cw00.choi@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/extcon/of_extcon.h>
/*
* of_extcon_get_extcon_dev - Get the name of extcon device from devicetree
* @dev - instance to the given device
* @index - index into list of extcon_dev
*
* return the instance of extcon device
*/
struct extcon_dev *of_extcon_get_extcon_dev(struct device *dev, int index)
{
struct device_node *node;
struct extcon_dev *edev;
struct platform_device *extcon_parent_dev;
if (!dev->of_node) {
dev_dbg(dev, "device does not have a device node entry\n");
return ERR_PTR(-EINVAL);
}
node = of_parse_phandle(dev->of_node, "extcon", index);
if (!node) {
dev_dbg(dev, "failed to get phandle in %s node\n",
dev->of_node->full_name);
return ERR_PTR(-ENODEV);
}
extcon_parent_dev = of_find_device_by_node(node);
if (!extcon_parent_dev) {
dev_dbg(dev, "unable to find device by node\n");
return ERR_PTR(-EPROBE_DEFER);
}
edev = extcon_get_extcon_dev(dev_name(&extcon_parent_dev->dev));
if (!edev) {
dev_dbg(dev, "unable to get extcon device : %s\n",
dev_name(&extcon_parent_dev->dev));
return ERR_PTR(-ENODEV);
}
return edev;
}
EXPORT_SYMBOL_GPL(of_extcon_get_extcon_dev);
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